For the last several years, Purafil company has been working with a number of institutions to develop and refine techniques with which conservators may accurately gauge the destructive potential of their environments toward those cultural relics, archives and so on. However, no definitive information currently exists which describes the cause-and-effect relationship between specific levels of gaseous pollutants and damage caused to artifacts and archival materials. Because of this, many are questioning the applicability and costs of direct gas monitoring and have turned to an alternate method of environmental classification – reactivity monitoring. This environmental analysis method is currently being used by a number of museums and archives. The validity for this air monitoring technique lies in the fact that many of the contaminants which are of primary concern in preservation environments are corrosive in nature, therefore, can be easily monitored by reactivity monitoring. It was the first involved the development of monitoring tools and techniques that could accurately assess local environments conditions, and the second was the formulation of a classification scheme that would allow conservators to determine if their environments were truly preservation environments or whether pollutant control measures were indicated. Corrosion classification coupons are passive monitors typically exposed to the environment for a period of 30-90 days and then analyzed for the amount and type of corrosion which has formed. This technique can provide cumulative reactivity rates, an assessment of environmental conditions over time, and an indication of type and relative level of corrosive gaseous pollutants. Environmental reactivity monitors (such as: OnGuard 2000) employing metal-plated QCMs can detect and records [more than]1x10-9(1ppb). This ability is regarded as one of the main requirements for any real-monitoring protocol to be used in preservation environments. A new standard for environmental assessments in preservation environments and reactivity monitoring techniques into conservators in China was introduced.